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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af54376260cce36337da875f9aecc1ad153061fed4604fff6c4c4d5d0c5774aa' 
  AND token = '9Anwin77486fsS281SJeV7ABNt602gvrYlDSOyIzWEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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