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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a82e3f8976209b42d20cada5d44534a0f2dcf5aa471b327e7f3ba0852ebd79b' 
  AND token = 'OBweFjEKxDxIfxLCHJrjTg5WOEx+KS3TDo//0moEWbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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