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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069db319d2ec8966a73017a091546828184b3713c7b5d760cd8cd022782f9cbc' 
  AND token = '74JtShFPzh3s+X0YiDGMUTKCLlNIbCA6aN4GT9QkRB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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