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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c3af34eb59ce27af1694b4dfc93a2a7fed1d1c7d8ca347f889cf8ebdfec45' 
  AND token = 'N6CQapcqtNt+Os3miG8Aym/SRhqX3nqQmX0blOgR/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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