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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcccc583cf31dd98ba70902fc72259639fd678dc1937480a593048d4188e37b' 
  AND token = 'LyCMcQq5zRLEyIQ/oqeAaSiwj58zTWleRnZPZUWARUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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