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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9135a40168cba106b88bc33b40632891567f9fcf85819940ec37832e0a91ea' 
  AND token = '7gmf/UcmM9PG+FVi3IDE15w72jRe2y/d2gWod56W8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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