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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17346d74b93b939d4a5a7ba9eab5ae7bf2238d987a599bde70fbef5db17220da' 
  AND token = 'MLfdJoiugp3Q8yOG36BZRBqtySb5GybaAZKMYch61xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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