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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a439751b84238e4429a435d6304a3c8e3a45b65f28e2544a212f82786468d74' 
  AND token = 'tdHrR08cHqBdDAAFtS+PfjP82Gmox37DoD8yt8AoIv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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