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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2b896107af0862d5a7809e7ec2f6083359fc13d3909a70b7e1663f50f74000' 
  AND token = 'om3TvbXqN8KRGCGwm1LpmigKvKZrz0jcvkAWsYT1ATc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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