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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baebe7b181e4c8d0d366e9d08998b6ab937ca3ddcfec4960b70824136c5601b1' 
  AND token = '2vYxBwXdisJpM0n4bjVoKDc6eJuOypQ8fs0zJKEeTeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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