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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e48ffc165b6ac6e4483d9959034853ab8e412373da377c4f31548c8d4db0bf' 
  AND token = 'lf5IusHvFVNilbzPUn8IMyGFwtINq8hIbbB547Rzmpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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