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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14da298f824fd45e122393c4dfa6eb50859b0eb6a89392c7a98ae064199bf93b' 
  AND token = 'bjKIdruczCA0vEmLib100q8mMcD2gF4DM+B86GWul6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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