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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0c783dd4bfe3068c3b1fde9742177246271e8f2d3d0e3db891f0897fa8430a' 
  AND token = '4vlb94+V+EjdEKmfagX84Wouh/c0c3GYkSnMKdeOmmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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