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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d598b852d738cb8a0f8ced1223009f9546cbff1c0a514d4bc9e822cd3dde0' 
  AND token = '0oiSIN2/1Cw3fyTba+890KC0VRzIiPttDLTNGZJyAa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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