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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34eb596b7b324fa8934c643ceb97defb16437e68c7fdb75bce6f78b21040fb3' 
  AND token = 'd8jmLapPfAh/kladqWbX+xSPGZEoAH9ZLn8slNQl5CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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