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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd56001df45b341774f3038dc7f009828ad8068464873f1f60ea4ee7bd282e9' 
  AND token = '4ZijYwMn0iwceFCSiQek2IbIWYxmYWbEN9aJv69XLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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