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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ffca5c76dd183efda4c0f20f9e18a87827150b994d4d7ec424ce456475870' 
  AND token = 'nih79fA25kDmX3Uwu/W2BD8pOqqv3Jdom3bijxulXDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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