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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35421bf4ecfbff49c9b5d856ee82d97cdd541bf7865dba266dda5bc1d02074ee' 
  AND token = 'O6o6nZPATrI5pbHk2QDNcNy9tsf9eb2VPMLS4hukfDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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