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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe669dfd2fbc769e623c3b892e09a0e0b7cc88e361072296c93532d2c71ad1' 
  AND token = 'dhOb5AGciLXdgMJSa1onhVY2aZW0EFpdGz4G2ecak7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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