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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef23b144a720685e134eb34c56a63dd23ecf6e099da4ea058aa3838674669d1' 
  AND token = 'pAW4v4Wk6XhmdBeOfvH5QS2kbg1O93vFjy5qAuWVXqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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