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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261f7b87086c52daf74b6b520006d395bc19b1a915ae583e72b2b2b64d80d895' 
  AND token = 'qAlTjPrgd0AEmB1oKJ2KuLigs/TbrL145xoRs6qBkRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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