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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aae6a70bc3289f471b8b1facb5a0452a04722d30bf950c74e45246e2f72cc8' 
  AND token = '4zEzza3jPoDaEDj7zZjUq9evCEDfrallrkjgM7uJSuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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