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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937f462e8d3b742501ed72bf73df28be06b1d1fc1bd0a9b7b7b9b3cc983d2347' 
  AND token = 'Yjh7j8Ilo3KZRryPkus+TaHl62o+uCPXxsxfoUML/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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