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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2947e0c88a8c13740574911058ce2801a8ba003350e5c92ea35f3f9d04321cd' 
  AND token = 'QH+84nZkMbe0JYHJdlmQ9gNJWxz9mL26Hhj91d80bNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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