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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff4ef1069580943610c6c57271d43916c660bcefe7ab44adfb3d81c5f33e06' 
  AND token = 'EkXwNf1rZXufkAYdttdVGdu9DDQa7Nwg/V+Z4bRnN/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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