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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44f3ef46e042229158c22ee78d98bbb2477c7efb9ecba33960de88fe03ab752' 
  AND token = 'foy03znxoHRfD+4dBpCekx4nHBX+WTZ72tk4aPmYu3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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