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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cead0fcc43b3dccd0f453614e868c8d9d0795a953373ecb72c77d717f959e6a6' 
  AND token = 'V2BzMIWk4/sve59e43t3GznBUB9rOBD0Di5UihVluCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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