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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e99f98554dde53f4fc56358c68f4112cda847c95fce1bfebef71a8482d5ea2b' 
  AND token = 'Q90Di3Y2vQdzjOXLUr9xeRICKPOgXGE9ManH0+Ufef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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