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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cfb887224427bbeda2a91ca2bb0e3751b2bb6fe4b4fce2f20f833f71a41ff1' 
  AND token = '4Ir3zGF0bZUjvHbDhyNFFFLE9DcocxRBQwNAYdH917E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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