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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4133e8551bc6ee694c8e79dff6a9b1433cbf08391fa20b9ac58825936550512d' 
  AND token = 'YhdYBeDqiE+/ko/duQWUb26EfFTcyKyUf4LNByF2DfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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