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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f8e0b0c4b83093d61dad9d1251d6cc5a448df3fa58024e020009bfbe4f2cf7' 
  AND token = '009N+7w3y/17Z9FjPtmFn42q7LbLrpq88Dh8a33IZb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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