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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8c98e60fef62c521a89e04c18ce7951ba72002e8d61c1919144c71060709ee' 
  AND token = '135AwKq1SYR9yg0cp7ZEkVb8b4OHNAfNIpLXqBXVuqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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