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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3a2946c049ca38a4712c6888fbcce07528dbc0bda33715b69b422cd15c5f10' 
  AND token = 'hRcNBYwF749GCdvNK8ac0Ux3pqvaxEcjs987EcOb12E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}