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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9919131ec3e0918e8ee9a88ccf11cf2c54a7b34ebaf4c067e69fbcebe237788c' 
  AND token = 'klV5GcV+i9/QtR4+ZR7GwtdX5VHkQjErvPWdq0dP2aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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