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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98786b2ddfc023967b57c168514e322e2702c3a56c7ca39b02b8218f9f24776f' 
  AND token = 'UQ7ayIP4WfYEU+dy6EoZfIeJugBeZGwda92NXOVbkvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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