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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e293c3b682ff595b6f4a765b9a255bbd287e589ff0bb56f893add61faf0fa2' 
  AND token = 'tBee/fC29Cl9eiMVDGr144n7wqBiuu+x4fgNuIB+Qec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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