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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0cc25a599e243f7a1401b7a64f6b680798553899979528874ae2bd3ca67505' 
  AND token = 'HQ+QKU4qOyJ+9Ipie/DtTjgxwuCe7T4d76QdeI3SeCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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