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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440bf9cdf5a3ce34e427db7e18f68f0d89a69ea477aa472a9f53ba6913159eba' 
  AND token = 'YDI6n9479wTIsigya2SmKS8fq54cG8LD0DaSXT4zajE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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