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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7d20ea664da7107386e56b2d27767469f096d3fc6b6b0c0f2a9d2c0bc85d19' 
  AND token = '4xxPp688+JDWjCftf6rmv0YMJFGq6SgoQkn+HSUjjks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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