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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b286eeb1b5b1767ea6540f2539ad9f039a86cbb4638a8acb891d5b3eeab89a' 
  AND token = 'VhjYnitzHvEuNLp6bAxYu3rVADhLVraOUXed5X0dXI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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