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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4ef038d1be099f2df9cefb3c77448c02a20d0fd2a5b5af56bd44dc92440a5b' 
  AND token = '2620gtK/tVmGFtw7Ab4SVAea2xVBXm034cigLXovTwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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