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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1bb8c9f6225ca66fd78f503bc35e0aaa06b1d26d7bbf64188df5481f7e7b6e' 
  AND token = 'i9sIcQxqILgopUmaMy+f5c8gormgwY3rEDUv6lv0TlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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